*** IMPORTANT ***
VIEW THIS IN FULL SCREEN MODE. OTHERWISE THE RESULTS ARE CONFOUNDED BY THE POOR ANTI-ALIASING OF THE VIMEO FLASH PLAYER ; - )
I'm sure this is well covered territory but I had a "WTF is that?" moment with the 7D this week and I thought I'd share.
I'd seen some interesting Moire patterns when using the 500D in 720P mode, but had not until recently stumbled onto a bad case of aliasing on the 7D. Architecture, with its straight lines, always seems to be your worst enemy when dealing with digital aliasing. This test is no exception. The shingles on the roof of the barn really result in quite a mess. Also notice the stair-stepping in the power lines.
The footage presented is the original 720P clips intermixed with 1080P clips of the same scene that were scaled to 720P using the standard 2D-FIR filter in MPEG streamclip. Either Canon really whiffed on anti-aliasing, or it's just not possible to do a good job in real-time using the available hardware in the camera.
So, the bad news is you have to be careful about what you shoot in the 60 fps mode. The good news is that there's rarely a compelling reason to over-crank shots of barns ; - )